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Eye care

Do Photochromic Lenses Protect Against UV?

How light-adaptive lenses react to UV light and what to check on the label.

Last updated November 3, 2026 · General information only, not medical advice. Please see a licensed eye-care professional for your prescription and eye health.

Woman wearing sunglasses

Photochromic (light-adaptive) lenses darken when exposed to ultraviolet light and fade back indoors. Because they respond to UV, most photochromic products are designed to block UVA and UVB both when clear and when dark.

What to check

  • Look for a stated "100% UVA/UVB" or "UV400" specification.
  • Remember that most car windscreens block UV, so photochromic lenses may not darken much while driving.
  • Darkening speed and depth vary with temperature — they are often darker in cold weather.

Read more on photochromic lenses and UV protection.

This article is general education, not medical advice. For any change in your vision or eye comfort, see a licensed optometrist or ophthalmologist.

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